Hello Giulio,
That error usually happens when you are trying to load an element that has not been rendered yet.
This error is coming from the highcharts_more script located in the main component which I think is outdated.
I got it to work by updating the script with the most recent version.

to do this open the SpiderWebReactiveChart module and go to Interface -> Scripts.

Double click on the script and replace the text.

This should work for you, but the creator of the Component should update the script.
Hope it helps!
Paulo Rosário